The Volkswagen AWH is a 1,781 cc, inline‑four turbocharged petrol engine produced between 2000 and 2005. It features a cast iron block, aluminium head, double overhead camshafts (DOHC), and 20 valves. Employing a Bosch Motronic ME7.5 engine management system and a K03 turbocharger, it delivered 150 PS, providing strong mid — range pull for its era.
Fitted to models such as the Mk4 Golf, Bora, and SEAT León, the AWH was engineered for responsive performance and everyday usa…
Volkswagen
Production years 2000–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5682).
The Volkswagen AWH is a 1,781 cc inline‑four turbocharged petrol engine engineered for compact performance hatchbacks and sedans (2000-2005). It combines a K03 turbocharger with a 20-valve head to deliver responsive power and strong mid-range torque. Designed to meet Euro 3 standards, it balances sporty character with acceptable emissions for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,781 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 20‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 81.0 mm × 86.4 mm | |
Power output | 110 kW (150 PS) @ 5,700 rpm | |
Torque | 210 Nm @ 1,750–4,500 rpm | |
Fuel system | Multi-point electronic injection (Bosch Motronic ME7.5) | |
Emissions standard | Euro 3 | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Garrett K03 (with integrated wastegate) | |
Timing system | Belt-driven (requires periodic replacement) | |
Oil type | VW 502 00 / 503 00 (SAE 5W‑40) | |
Dry weight | 147 kg |
The Volkswagen AWH was used across Volkswagen's Mk4 platform with transverse mounting. This engine received platform-specific adaptations-unique engine mounts for the Bora sedan-and was also fitted to SEAT models sharing the PQ34 platform. All adaptations are documented in OEM technical bulletins.
The AWH's primary reliability risk is coolant loss from the plastic flange, with elevated incidence in high-mileage or poorly maintained vehicles. Volkswagen STB 20-08-03 M2 documents this widespread issue, while owner reports frequently cite timing belt neglect as a cause of catastrophic failure. Infrequent coolant changes and extended service intervals make proactive flange replacement and strict timing belt adherence critical.
Analysis derived from Volkswagen technical bulletins (2000-2005) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The AWH can be very reliable long-term if its known issues are addressed. The plastic coolant flange must be replaced with the metal version, and the timing belt service is non-negotiable. With these items sorted and regular oil changes using the correct spec, the engine is robust and tunable.
The top issues are coolant leaks from the plastic flange (STB 20-08-03 M2), catastrophic engine damage from timing belt failure, ignition coil pack failures causing misfires, and faults in the secondary air injection system triggering check engine lights.
The AWH was primarily used in the Mk4 Golf GTI (2000-2005) and Bora/Jetta 1.8T (2000-2005). It was also fitted to the SEAT León Cupra and Toledo Mk2 1.8T during the same period, as these models shared the VW Group's PQ34 platform.
Yes, the AWH is highly tunable. A simple ECU remap can safely increase power to 180-200 PS. Further upgrades like a larger turbo (K04), intercooler, injectors, and exhaust can yield 250+ PS. The bottom end is strong, but supporting mods are crucial for reliability at higher power levels.
Fuel economy is moderate for a performance engine. Expect around 8.5-9.5 L/100km (30-33 mpg UK) in mixed driving for a stock AWH. Aggressive driving or tuning will significantly increase consumption. Highway cruising can return ~6.5 L/100km (43 mpg UK).
Yes. The AWH is an interference engine. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing severe and expensive internal engine damage. This makes adhering to the timing belt replacement schedule absolutely critical.
Volkswagen specifies oil meeting VW 502 00 or 503 00 standards, typically a 5W-40 synthetic. Using the correct oil is vital for turbocharger and engine longevity. Change intervals should not exceed 15,000 km or 1 year, even if the car's service indicator suggests otherwise.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with VOLKSWAGEN or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
VOLKSWAGEN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialVOLKSWAGEN documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.